Just to let you all know, I phoned BA today and asked whether they could clarify what is regarded as a 'core academic' subject, most importantly of all whether my PE Alevel qualified. To my delight she came back minutes later and said that all subjects excluding general studies (to her knowledge) counted.
I asked her about the Physics and Maths, she just said in the past these have been preferred subjects as they give an early indication whether a student can cope with the workload that is expected of them during the course, but she did reiterate the point that all Alevels EXCEPT General studies were accepted.
Time to start filling in my application form !!